59results about "Motor control for high speed" patented technology

The invention relates to the technical field of motor control, and discloses an axial magnetic flux hybrid excitation synchronous motor field weakening control system based on multi-source feedback. According to the system, a motor digital twinborn model is constructed, and real-time operation data are collected by using a multi-source sensor and synchronized to the model; establishing a three-dimensional electromagnetic field state space based on the model, extracting features through a manifold neural operator, and generating a multi-dimensional excitation state feature set; determining an excitation anomaly feature index set according to the feature set distribution density; collecting data in real time, extracting current excitation characteristic parameters, mapping the current excitation characteristic parameters to a three-dimensional electromagnetic field state space, calculating spatial correlation with the abnormal index set, and outputting weak magnetic demand correlation factors; and finally, according to the correlation factor, the feature set and real-time data iteration updating operator parameters, a control instruction is generated to dynamically adjust the coupling proportion of the electrical excitation component and the permanent magnet excitation component. According to the system, comprehensive perception and accurate regulation and control of the motor operation state are realized, and the adaptability and reliability of field weakening control are improved.

The present invention discloses a multi-pole and few-slot unitized permanent magnet hub motor and a coordinated control system and method. The motor is composed of N identical motor units uniformly distributed in the circumferential direction of a radial section, each 1 / N outer rotor is divided into M identical rotor segments along the axial direction, and the M rotor segments are rotated in sequence along the same rotation direction by a mechanical staggered angle arrangement; the constant torque area is divided into a first area and a second area, and the constant power area is divided into a third area to an eighth area. The control system includes two control modules, each of which is composed of a power electronic switch, a DSP controller and an inverter connected in series in sequence, the input ends of the two power electronic switches are respectively connected to the output ends of a battery, the output end of each inverter is respectively connected to N / 2 winding electronic switches, one winding electronic switch controls the on and off of a centralized winding in a motor unit, and the mutually independent winding electronic switches realize independent control of the motor unit, thereby improving the motor control freedom and operation efficiency.

The electro-mechanical actuator of a wind turbine is configured to be powered from a DC link intermediate circuit. A method for controlling the actuator includes: determining whether a voltage demand and a power demand for operating the electro-mechanical actuator at a specific operating point can be met by an output of a first converter. The first converter is connected to a supply grid and configured to provide a first voltage and a first power to the DC link intermediate circuit; and, when the voltage demand and the power demand cannot be met, triggering a boost mode of a second converter connected between the DC link intermediate circuit and an energy store. The boost mode is triggered to: boost the voltage at the DC link intermediate circuit to a second voltage; and, boost the power supply to the electro-mechanical actuator via the DC link intermediate circuit to a second power.

The invention discloses a control device and a control method for suppressing circumferential torque pulsation and radial vibration of a motor. The compensation current data table, the proportion setting part and the voltage conversion part are used for providing a torque ripple compensation current iqnh * for circumferential torque ripple suppression of the synchronous motor and providing a radial vibration compensation current idnh * for radial vibration suppression caused by increase of radial electromagnetic force harmonic waves of a stator for hybrid injection control, q-axis compensation current is injected, circumferential torque ripple is suppressed, and the torque ripple is suppressed. Meanwhile, d-axis compensation current is injected to suppress circumferential torque pulsation, reduce the radial vibration influence generated by q-axis compensation current and eliminate the increasing part of radial electromagnetic force; and a good circumferential torque ripple suppression effect is kept and radial electromagnetic force is prevented from being increased when the motor is at a low rotating speed and a high rotating speed, so that the risk of increasing stator vibration is avoided.

A circular saw may include a base plate and a blade guard assembly coupled to the base plate, the blade guard assembly including an upper blade guard and a lower blade guard movable between an extended position and a retracted position. A circular saw may include a housing assembly coupled to a saw blade guard assembly, an output shaft, and a saw blade clamp coupled to the output shaft, the saw blade clamp configured to hold a saw blade. The circular saw may include a brushless direct current (DC) motor positioned within the housing assembly and operable to rotate the output shaft. The circular saw may include an electronic controller configured to perform a field weakening operation on the brushless DC motor.

To provide an electronic circuit capable of suppressing ringing of a current flowing when a switching element is turned on.SOLUTION: An electronic circuit has a drive circuit that supplies a drive current to a control terminal of a first switching element and increases the drive current in accordance with first time at which a current flowing through a second switching element connected to a first terminal or a second terminal of the first switching element becomes zero.SELECTED DRAWING: Figure 7

Figure 4 shows peak torque capability CPTQ 110 of a torque generating machine (e.g. electric motor of a vehicle). A vehicle controller progressively limits the peak torque output CPTQ 110 of the torqu

The invention belongs to the technical field of motor control, relates to an energy consumption parameter optimization method and system of a permanent magnet motor, and is suitable for high-speed flux-weakening speed expansion area control of a high-power water-cooling permanent magnet servo motor. Three-phase current, bus voltage, winding temperature and cooling medium temperature of a stator are collected, direct-axis current is obtained through coordinate transformation, fundamental wave and high-frequency harmonic components are separated through variational mode decomposition, and a high-frequency harmonic thermal stress index is constructed; calculating a dynamic magnetic resistance saturation coefficient by combining the effective temperature difference; constructing a total power loss evaluation model containing a copper loss item, an iron loss item and a high-frequency additional loss item; and under the condition that the output torque requirement is met, the direct-axis current is optimized through an optimization algorithm by taking the minimum predicted total loss power as a target, and the direct-axis current is input into a controller. Accurate evaluation and control of the actual power loss of the permanent magnet motor under all working conditions are realized, and the operation energy consumption of a high-speed weak magnetic area is reduced.

A system and method for controlling a six-phase machine include generating a plurality of control vectors for the six-phase machine. The six-phase machine is configured as a combination of a first three-phase machine and a second three-phase machine. Each of the plurality of control vectors is generated by combining two phase vectors from the six-phase machine, where one phase vector is selected from the first three-phase machine and another phase vector is selected from the second three-phase machine. The system and method also include implementing a control method based on the plurality of control vectors to control the operation of the six-phase machine.

A motor device prevents electrolytic corrosion of a bearing. The motor device is mounted on a vehicle and has a stator installed in a housing and provided with a concentrated winding coil, a rotor housed in the center of the stator and provided with a permanent magnet, a bearing installed in the housing and supporting a rotating shaft of the rotor, an inverter provided between the stator and a power storage body and controlling an energization state of the concentrated winding coil, and an energization control section that outputs a control signal to the inverter and executes field weakening control that generates a magnetic flux of the concentrated winding coil in a direction to weaken a magnetic flux of the permanent magnet. The energization control section executes the field weakening control to make a potential difference between the housing and the rotating shaft, i.e., shaft voltage Va1, lower than a withstand voltage Vb1 of the bearing when a motor revolution number Nm is greater than a threshold value Nx.

The application discloses a motor control method, device and system, a motor and an electrical equipment, and belongs to the field of motor control. When a motor enters a field weakening control state, a bus voltage of a frequency converter for controlling the motor is acquired. If a bus voltage drop value in a unit time is detected to exceed a preset voltage value, it is indicated that the bus voltage drops too fast. At this time, if the frequency is directly reduced, the frequency reduction speed is relatively slow, the operating current increases too fast, overcurrent protection is triggered, and the system is shut down. Therefore, the application scheme first increases the carrier frequency of the frequency converter to a preset carrier frequency, and then switches an integral term in a control parameter of the motor to a value corresponding to the preset carrier frequency. In this way, when the frequency is reduced, the frequency reduction speed of the motor can be accelerated, the operating current is prevented from increasing too fast, overcurrent protection is not triggered in the process in which the motor reduces the frequency and exits the field weakening control state, and normal operation of the system is ensured.

A motor driving apparatus includes a motor having a plurality of windings, a dual inverter including a first inverter connected to first ends of the plurality of windings and a second inverter connected to second ends of the plurality of windings and configured to drive the motor through at least one of the first inverter or the second inverter according to a motor driving mode, and a controller configured to determine whether flux weakening control is performed according to an available voltage level of the dual inverter when a switching condition of the motor driving mode is satisfied and to perform the flux weakening control by linearly adjusting an output voltage level of the dual inverter for a preset time interval for which the flux weakening control is performed.

A portable fan configured with a high-speed three-phase motor is provided, the portable fan includes: a control module, a drive module, and the high-speed three-phase motor. The high-speed three-phase motor has an operating voltage of 2V to 18 V and an operating current of 0.1 to 10 A, and / or has a rated operating power of 0.5 to 100 W. The control module is configured to control, via the drive module and based on the operating voltage, the operating current, and / or the rated operating power, a rated operating rotation speed of the high-speed three-phase motor to reduce noise generated due to a high rotation speed of the high-speed three-phase motor and to control an air speed to be within a preset air speed range.

The invention relates to a method and a control device (2) for controlling a BLDC motor (3), which is controlled by means of a control unit (5) and power electronics (4), wherein the power electronics (4) includes several individual phases (x, y, z) of the BLDC motor (3), supplied by a predetermined supply voltage (U) from a DC voltage source (6), with power transistors and freewheeling diodes supplying voltage pulse widths according to specifications of the control unit (5), and wherein an intermediate circuit (7) with at least one intermediate circuit capacitor (8) is connected in parallel to the power electronics (4). In order to protect the power electronics (4), in particular the freewheeling diodes, during field weakening operation of the BLDC motor (3), the intermediate circuit (7) is disconnected from the supply voltage (U) during field weakening operation.

The invention discloses a method for calculating flux weakening control reference current of a permanent magnet motor, and the method comprises the steps: calculating a voltage constraint coefficient according to the voltage of a DC bus, the flux linkage of a permanent magnet and the maximum no-load rotation speed, and representing the voltage limitation degree of a high-speed region; the weak magnetic expected current is directly obtained according to the coefficient, and rapid analysis without additional control links is achieved; the weak magnetic current is corrected by combining the motor resistance and the operation current, so that the adaptability of a high-speed region is improved; and the flux weakening current range is automatically constrained through current amplitude limiting judgment, and the safe operation margin is ensured. Error accumulation of torque control reference current can be avoided, and the control precision of a weak magnetic region is remarkably improved; double mechanisms of dynamic compensation and amplitude limiting protection are adopted to adapt to complex working conditions of a high-speed area, and the anti-interference capability is excellent; an additional PI controller or a torque current calculation module is not needed, the real-time performance is high, and engineering implementation is facilitated; and the voltage constraint is accurately matched, the utilization efficiency of the DC bus voltage is maximized, and higher rotation speed expansion is supported.

A control method of a lifting type AGV based on a permanent magnet motor, comprising the following steps: a plurality of image acquisition devices are arranged in a line through which the AGV passes, and the image acquisition devices are used to acquire a orthographic projection image of the AGV when the AGV carries goods; in the orthographic projection image, a midpoint of the goods is acquired, a vertical distance and a horizontal distance are acquired; the weight of the goods is acquired, and according to the weight of the goods and the horizontal distance, an adjustment coefficient of the rotational inertia is acquired in a preset adjustment coefficient table; according to the vertical distance and the weight of the goods, a preliminary rotational inertia of the goods is acquired; the angular velocity V1 of the chassis motor is acquired, and the angular velocity V2 of the tray motor is calculated according to the angular velocity V1 and the final rotational inertia; through accurate calculation and real-time adjustment, the present application can reduce the carrying failure and safety hazards caused by inaccurate goods position or mismatched rotational inertia, thereby improving the carrying efficiency and safety. At the same time, intelligent control also reduces the need for manual intervention and reduces labor costs.

The present invention relates to a method (100) for determining a target flux value for subsequent field weakening control of a permanent magnet synchronous motor. The method (100) comprising: inputting (S102) an actual voltage, a reference voltage, and an actual speed of the motor to a controller comprising a proportional term having a proportional gain factor, and an integral term having an integral gain factor; setting (S104) the proportional gain factor based on the actual voltage and the reference voltage; and determining (S108) the target flux value based on an output from the controller. The present invention further relates to a device thereof.

The invention discloses a control method and device of a compressor, the compressor, a storage medium and a computer program product. The compressor is provided with a winding cutting motor and a winding switching module. The control method of the compressor comprises the steps that under the condition that the compressor runs, the target frequency of the compressor is obtained; and under the condition that the compressor is not stopped, the winding switching module is controlled to switch the connection state of the winding of the motor according to the target frequency of the compressor, so that the actual operation frequency and the actual energy efficiency of the compressor are adjusted. According to the scheme, under the condition that the compressor is not shut down, the connection state of the motor winding is controlled according to the target frequency of the compressor, and the operation frequency and high-frequency energy efficiency of the compressor are improved.

The invention relates to an electric machine (1), in particular for use within the powertrain of a hybrid or fully electrically driven motor vehicle, comprising a stator (2) and a rotor (4) which is separated from the stator (2) by an air gap (3), wherein the rotor (4) has at least one first rotor body (5) with a first group of permanent magnets (6) and a second rotor body (7) with a second group of permanent magnets (8). The first rotor body (5) and the second rotor body (7) can be rotated relative to each other about a common rotational axis (10) against the effect of a first rotational stiffness (9) by means of a mechanical field-attenuating mechanism (11), and at least one first spring leg (17) of the first leg spring (13) is held in a first receiving shoe (30), which is received in a first receiving pocket (31) of the first rotor body (5) and is fixed to the first rotor body (5) such that the first spring leg (17) of the first leg spring (13) is coupled to the first rotor body in a play-free manner in the axial direction as well as in the circumferential direction relative to the first rotor body (5).

The invention discloses a multi-mode control method and system for a permanent magnet synchronous motor based on function tooth shoe salient pole rate programming, and relates to the technical field of motor control. According to the permanent magnet synchronous motor control method, the characteristic that the salient pole rate is influenced by the magnetic saturation phenomenon of a stator tooth shoe is utilized, geometric parameters of the tooth shoe are converted into a physical carrier for salient pole rate programming, a mapping relation of tooth shoe thickness-magnetic saturation degree-salient pole rate is constructed, and a nonlinear salient pole rate curve is preset according to the mapping relation. And carrying out collaborative optimization on structural design and control robustness. The actually measured salient pole rate is used as a mode switching criterion, the control mode is switched according to a preset smooth salient pole rate curve under the working conditions of light load, heavy load and flux weakening, and step changes such as the rotating speed and the torque are avoided. According to the method, the software calculation load is reduced through tooth shoe function profile structure hardware pre-programming, the problems of overshoot and response delay of control switching under various working conditions are solved, and the dynamic robustness of the system is improved.

The invention relates to a speed-adjustable fan which comprises a fan assembly, a speed adjusting unit and a control unit. The control unit adjusts the rotating speed of the fan assembly based on a signal generated by the speed adjusting unit, the signal generated by the speed adjusting unit is generated based on the operation mode of a user, and the operation mode comprises the operation distance, the operation speed and the operation frequency. By the adoption of the fan, accurate control over the air speed of the fan can be achieved, a user can flexibly adjust the air speed according to needs, and more comfortable use experience is obtained.

A unitized permanent-magnet in-wheel motor comprises identical motor units 1 evenly distributed along a circumference of a radial section. Each of the motor units comprises an outer rotor 2, inner sta

A unitized permanent-magnet in-wheel motor comprises identical motor units 1 evenly distributed along a circumference of a radial section. Each of the motor units comprises an outer rotor 2, inner sta

A circular saw may include a shoe and a blade guard assembly coupled to the shoe, the blade guard assembly including an upper blade guard and a lower blade guard movable between an extended position and a retracted position. A circular saw may include a housing assembly coupled to the blade guard assembly, an output shaft, and a blade clamp coupled to output shaft, the blade clamp configured to hold the saw blade. A circular saw may include a brushless direct current (DC) motor positioned within the housing assembly and operable to rotate the output shaft. A circular saw may include an electronic controller configured to perform a field weakening operation on the brushless DC motor.

In one embodiment, electronic circuitry includes a driving circuit that is configured to: supply a driving current to a control terminal of a first switching element; and increase the driving current in accordance with a first time at which a current flowing through a second switching element connected to a first terminal or a second terminal of the first switching element becomes 0.

The present application relates to the field of motor control technology, and specifically to an optimization control method, system and equipment for low-voltage high-power motors, which specifically include: determining the load authenticity of the low-voltage high-power motor according to the output power change and temperature change of the low-voltage high-power motor; determining the load distribution benefit ratio of the low-voltage high-power motor according to the output power change of all stator modules in the low-voltage high-power motor; obtaining the load contribution of the stator module according to the difference between the load of the stator module and the average level and the load distribution benefit ratio of the motor; determining the disabling requirement of each stator module according to the change in the load authenticity and the change in the load contribution, and optimizing the control of the low-voltage high-power motor, reducing the influence of the stator modules running at low load and overload on the motor operation efficiency, significantly improving the performance of the low-voltage high-power motor, and improving the coordination between different stator modules.

A field weakening control method based on rotor position angle adaptation includes the following steps: S1, the motor controller collects motor speed, motor torque, stator current, angular velocity of the motor in its natural coordinate system, and DC bus voltage of the motor controller in real time, and sets the threshold range of voltage deviation [ΔU]. min ,ΔU max S2, determine the current operating condition of the motor based on the motor speed and motor torque; S3, determine whether the voltage deviation between the DC bus voltage and the back electromotive force meets the requirements. If it meets the requirements, directly output the current requested direct-axis and quadrature-axis currents of the motor; if it does not meet the requirements, proceed to step S4; S4, perform adaptive control on the rotor position angle to make the voltage deviation between the DC bus voltage and the back electromotive force within the set threshold range; S5, redistribute the direct-axis and quadrature-axis currents of the motor based on the rotor position angle obtained after adaptive control; S6, the motor controller outputs the redistributed direct-axis and quadrature-axis currents.

The invention discloses a synchronous motor torque ripple suppression control device and method, and the device comprises a compensation current data table, a proportion setting part and a voltage conversion part which are used for providing the hybrid injection control of compensation current and compensation voltage for the torque ripple of a synchronous motor. The q-axis compensation current and the d-axis compensation current are injected into a q-axis current instruction and a d-axis current instruction output by the current instruction conversion part respectively, and the d-axis compensation voltage and the q-axis compensation voltage output by the voltage conversion part are connected to the corresponding input ends of the dq / uvw conversion part respectively. And the electrical speed of the position speed calculation part is respectively accessed to the compensation current data table, the proportion setting part and the voltage conversion part. And a good torque ripple suppression effect can be kept when the synchronous motor is at a low rotating speed and a high rotating speed.

A method that involves determining the maximum operating speed of an electric motor under varying torque conditions, specifically at speeds surpassing its rated speed. Initially, the motor is operated at its highest speed across different torque values, establishing a data set of real measurement points. These points illustrate the relationship between the maximum motor speed and the applied torque. A coefficient (COF), ranging from 0 to 1 and dependent on motor characteristics, is selected. Two curves are then established: the first for lower maximum speeds, represented byΩr⁢e⁢f=COFPn⁢o⁢mTm⁢e⁢a⁢s,and the second for torques below a defined limit torque Tlim expressed asΩr⁢e⁢f=COFPn⁢o⁢mf⁡(Tm⁢e⁢a⁢s),where ƒ is a polynomial function derived from the measurement points. The appropriate curve is then used to ascertain the maximum motor speed for a given torque, based on whether the torque is greater or lesser than Tlim.

The invention relates to a method for controlling a three phase synchronous-reluctance or synchronous rotating machine (4) with permanent magnets, comprising the following steps: - measuring a current (iA, iB, iC) flowing in each of the phases of a stator of the rotating machine (4); - first calculation, by means of a single proportional-integral controller, of a commutation control signal for controlling an inverter (10), as a function of each measured current (iA, iB, iC), and a target value (Tref) of a mechanical torque supplied by the rotating machine (4) or of a target value of an angular velocity of a rotor of the rotating machine (4) with respect to the stator, the inverter (10) being configured to convey electrical power between a DC source (8) of electrical power and each phase of the stator of the rotating machine (4); - control of the inverter (10) by means of a calculated commutation control signal.